Sharpening implement



/% QINQENTOR BY NEY July 27 1926.

J. HOLTZMAN SHA'RPENING IMPLEMENT Patented July 27, 1926.

UNITED STATES JOHN HOLTZMAN, O1? NEW'YORK, N. Y.

SHABPENING IMPLEMENT.

Application filed December 12', 1924-.

This invention relates to sharpener-s of the type utilizing hardened steel disks mounted with their peripheries in contact, and in the junction of which peripheries the edge of a blade may be lodged and sharpened by the relative passage of the disks astride of and along the blade.

The principal object of the invention is to provide an eflicient and improved portable sharpening implement of the above type, which may be utilized with maximum accuracy for the performance of its function and with the utmost safety to the user.

Another object is to provide a sharpening implement of the above type equipped with improved means for rendering it utilizable for the sharpening of scissors, agricultural tools, or other devices having edges of definite cutting angles, with means for accurately guiding their blades in the sharpening operation, with means for accurately adjusting such guiding means to the required angles of such edges, and with means for securing the guiding means in such adjusted positions.

Other objects and advantages will here inafter appear.

In the accompanying drawings,

Fig. 1 is an elevation of the sharpening implement, showing it in the position when it is in the operative state.

Fig. 2 is a plan view of a portion of the implement, as viewed in the direction of the arrow, Fig. 1.

Fig. 3 shows an elevation of a detail of the implement.

Figs. 4 and 5 show a plan and elevation, respectively, of a modification of the implement.

Figs. 6 and 7 show other modifications of the improvements.

The sharpening implement 1, Fig. 1, is provided with a pair of hardened steel sharpening disks 2 that are mounted, with their peripheries 8 in contact with each other, Fig. 2, upon a fiat plate or frame 4. Each of the disks 2 is secured in place, by means of a screw 5 passing through a central opening in thedisk and threading into a tap opening in the frame 1. From the frame t extends a shank 6 which is inclined, away from its face, to which the disks 2 are secured, at an angle of 225 degrees. To the shank 6 is rigidly secured a suitable handle 7 in the usual manner, whereby upon firmly grasping the sharp- Serial no. 755,517.

ening implement with the handle 7 and maintaining the latter rightangularly to the cutting edge 8 of any blade 9, with the disks 2 astride of said edge, the disks are disposed at an angle of 15 degrees to the edge 8, which is the correct inclination, or cutting or sharpening angle, at which the disks must be maintained, in an implement utilizing this type of coacting disks. As the implement is now moved along the edge 8, toward the right as viewed in the drawing, therefore, the disks 2 will cut or sharpen the edge 8 with the utmost efiiciency, and upon passing the implement over the blade 9 in this manner several times the latter will become fully and efliciently sharpened. It will be evident that this provision for maintaining the handle 7 rightangularly to the edge 8 affords a most efiicient means for manually maintaining the disks 2 at proper angularity during the sharpening operation, inasmuch as maintenance of a handle at 90 degrees to an edge is in conformity with the nearest natural ascertainable angle of disposition of any object to any line or surface, and such disposition being once maintained the cutting disks automatically as sume their requisite inclination of degrees to the edge operated upon. It will be further evident that this disposition of the handle permits of a firm grasp thereupon by the users fist during the sharpening, and locates the users hand and arm at a maximum distance from the blade-edge 8, where by this disposition is thus conducive to a firmer and more efficient sharpening action, and to maximum safety to the users hand and arm, without impairing the requisite angularity of the disks to the blade-edge.

As the edge 10 of each disk is likely to become worn after some use, at the throat or meeting point 11 of the two disks, the latter may be adjusted to bring other portions of the unused edges 10 in contact, by means of loosening the screws 5, partially rotatingthe disks to bring new portions of the edges 10 in contact, and then tightening the said screws. Should the entire edges 10, after repeated resettings of the disks become completely worn, the screws 5 may be completely removed, the disks 2 reversed so as to bring their edges 12 to an operative disposition, and then the screws 5 may be retightened thereby providing entirely new sharpening cutting-edges for the implement. Upon the opposite side of the plate 4 is pivotally mounted a guide 13, by means of a bolt 14 having a square portion 15 passing through a square opening 16 in the frame, a threaded shank 17 thereof pass ing through the strip 18 of the guide, and a thumb-nut 19 threading over the shank 17 and against the strip 18. The guide 13 is configurated as a loop 20 which passes over the frame 4 and disks 2, thereby providing another strip-portion 21, or a strip-portion at each side of the disks 2. When it is desired to sharpen the blade of scissors, shears, lawn mowers, or any other blade, the edge of which has a required angularity, the guide 13 may be set about its pivot at an angle to the periphery of either of the disks 2 corresponding to the angle of such edge, the nut 19 may be tightened so as to secure the guide in such adjusted position, the blade 9 may be then positioned with its side 9 against the edges of the guidestrips 18, 21, in the manner shown in Fig. 2, and the implement may be then passed relatively along the blade 9 with the guide 13 in this position, and the edge of the blade 9 thereby accurately and efiiciently sharpened. It will be evident that the guide 13 may be reset to suit the angularity of any blade-edge and secured in such reset position, that the guide may be utilized in connection with either of the disks 2, that its strips 18, 21 serve to maintain the plane of the blade to be sharpened rightangularly to the disks and impart proper angularity to the bladeedge, and that, when not in use, the guide may be swung away to the position shown by the dot and dash lines, Fig. 2, to permit the implement to be used for sharpening knives or similar tools in the manner shown in Fig. 1.

According to the modification shown in Figs. 4, 5 the frame 1 consists of three platesections 22, 23, which are secured to each other by means of the rivets 24:, and maintain the disks 2 between them in the manner shown, without requiring utilization of the screws 5 shown in Fig. 1. In order to bring new edge-portions of these disks into and partially rotated.

According to the modification shown in Fig. 6, four disks 2 are mounted in contact with each other upon a frame 4", thereby providing a plurality of throats 11, each of which may be reserved specially for the sharpening of various tools, and the guide 13 being utilizable in connection with any one of said disks. When either of the throats 11 is used in the sharpening operation the pair of disks 2 and portion of frame 4: oppo site thereto may be utilized as a holder for this implement.

According to the modification shown in Fig. 7, a pair of scissor-like sharpening blades 25 are pivotally mounted upon a frame 4 secured to a handle 7. Said blades are pivoted by means of an adjusting and securing bolt 1 1 and nut 19 similar to those shown in Fig. 1, and the frame 1 has a projection 20 formed as a guide similar to that shown in Fig. 3. Upon swinging the blades 25 away from the guide 20, adjusting the blades to form any desired angle between their cutting edges 26, and then securing the blades in such adjusted position with the nut 19, the edge of a knife or similar tool may be passed through the junction of the edges 26 and thereby sharpened. And when it is desired to sharpen scissor-blades or similar tools, either of the blades 25 may be adjusted and set to form the requisite angle relatively to the guide 20, corresponding to the angle of the edge to be sharpened, and then the tool may be sharpened in the manner indicated in Fig. 7.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim 1. A sharpener of the class described having a pair of sharpening discs in contact with each other and lying in the same plane, a frame carrying said disks, and a handle for said frame being disposed relatively to said. disks at such angle whereby holding it with its longitudinal axis in the plane of a blade to be sharpened and rightangularly to its edge will maintain said disks at the requisite sharpening angularity to such edge.

2. A sharpener of the class described having a pair of sharpening disks in contact with each other and lying in the same plane, a frame carrying said disks, a handle for said frame being disposed relatively to said disks at such angle whereby holding it with its longitudinal axis in the plane of a blade to be sharpened and rightangularly to its edge will maintain said disks at the requisite sharpening angularity to such edge, and a screw passing through each of said disks and threading into said frame to permit rotation and reversal of said disks.

3. The combination of a sharpening disk, a frame carrying said disk, a guide for blades pivoted to said frame to swing relatively to the periphery of said disk for adjusting the guide to blades of different angularities, and means to secure said guide in adjusted position.

41-. A sharpener of the class described having a pair of sharpening disks in contact with each other, a. frame carrying said disks, a handle for said frame being disposed relatively to said discs at such angle whereby holding it with its longitudinal axis in the plane of a blade to be sharpened and rightangularly to its edge will maintain said disks at the requisite angularity to such edge, a guide for blades pivoted to said frame to swing relatively to the peripheries of said disks for adjusting the guide to blades of different angularities, and means to secure said guide in adjusted position.

5. A sharpener of the class described having a pair of sharpening disks in contact with each other, a frame carrying said disks, a handle for said frame being disposed relatively to said disks at such angle whereby holding it to be sharpened and rightangularly to its edge will maintain said disks at the requisite sharpening angularity to such edge, removable means for securing said disks to said frame being adapted to permit rotation and reversal of said disks, a guide for blades pivoted to said frame to swing relatively to the peripheries of said disks for adjusting the guide to blades of different angularities, and means to secure said guide in adjusted position.

6. A sharpener of the class described hav ing a pair of sharpening disks in contact with each other, a frame carrying said discs, a handle for said frame being disposed relatively to said disks at such angle whereby holding it with its longitudinal axis in the plane of a blade to be sharpened and rightangularly to its edge will maintain said disks at the requisite sharpening angularity to such edge, a screw passing through each of said disks and threading into said frame to permit rotation and reversal of said disks, a guide for blades pivoted to said frame to swing relatively to the peripheries of one of said disks for adjusting the guide to blades to different angularities, and means to secure said guide in adjusted position.

7 A sharpener of the class described having a pair of sharpening disks in contact with each other, a frame carrying said disks, a handle for said frame being disposed relatively to said disks at such angle whereby holding it with its longitudinal axis in the plane of a blade to be sharpened and rightangularly to its edge will maintain said disks at the requisite sharpening angularity to such edge, removable means for securing said disks to said frame being adapted to permit rotation and reversal of said disks, a guide for blades pivoted to said. frame to swing relatively to the periphery of either of said disks for adjusting the guide to blades of differentangularities, and means to secure said guide in adjusted position.

8. The combination of a sharpening element, a frame carrying said element, a guide for blades, said element and guide being pivoted relatively to each other for adjusting the guide to blades of different angularities, and means to relatively secure said element and guide in adjusted position.

9. The combination of a plurality of sharpening disks lying adjacent to each other in the same plane, a frame carrying said disks, said disks being disposed in contact with each other to provide a plurality of cutting junctions, and a guide for blades being pivoted to said frame and adapted to cooperate with either of said disks.

10. A sharpener having the combination with a pair of sharpening disks, of a plate having its edge configurated to adapt it to hold said disks in contact with each other and against axial displacement, and a plate at each side of said disks to maintain them against lateral displacement.

11. The combination of a pair of sharpening disks, a frame carrying said disks, and a guide for blades pivoted to said frame to swing relatively to the peripheries of either of said disks for adjusting the guide to blade-edges of different angularities with relation to either disk.

12. The combination of a pair of sharpening disks, a frame carrying said disks, a guide for blades pivoted to said frame to swing relatively to the peripheries of either of said disks for adjusting the guide to blade-edges of different angularities, and means to secure said guide in adjusted position.

13. A sharpener having the combination with a pair of sharpening disks, of a plate having its edge configurated to adapt it to hold said disks in contact with each other and against axial displacement, a plat-e at each side of said disks to maintain them against lateral displacement, a guide for blades pivoted to said frame to swing relatively to the peripheries of either of said disks for adjusting the guide to blade-edges of different angularities, and means to secure said guide in adjusted position.

14. The combination of a sharpening disk, a frame carrying said disk, a guide for blades pivoted to said frame to swing relatively to the periphery of said disk for adjusting the guide to blades of different angularities, and means to secure said guide at its pivot in adjusted position.

15. A sharpener of the class described having a pair of sharpening disks in contact with each other, and a handle therefor being disposed relatively to said disks at such angle whereby holding it with its longitudinal aXis in the plane of a blade to be sharpened and rightangularly to its edge will maintain said disks at the requisite sharpening angularity to such edge.

Signed at the city of New York, in the county of New York and State of New York, this 11th day of December, A. D. 1924.

JOHN HOLTZMAN. 

